期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 48, 页码 19368-19374出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm13889h
关键词
-
资金
- Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korea government Ministry of Knowledge Economy [20104010100560]
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2009-0092780]
It is important to increase the energy density of olivine-type cathode materials utilizing micro-sized particles for rechargeable lithium batteries. However, according to the literature, micro-sized LiMn1-xFexPO4 compounds have limited specific capacity because they exhibit lower electrical conductivity than nano-sized materials: isolation of the inner part of the particles from the electrolyte results in an electrochemically inactive area during cycling, which hinders proper Li+ transport that causes the failure of the micron-sized particles. To improve the electrical conductivity of micro-sized LiMn1-xFexPO4, we designated micro-sized C-LiMn0.5Fe0.5PO4 materials composed of nanopores in the micro-sized particles synthesized via co-precipitation. The resulting morphology was spherical, showing a tap density of 1.27 g cm(-3), and uniform carbon coating layers on the primary particles with nanopores were observed in the secondary particles. The as-synthesized micro-sized C-LiMn0.5Fe0.5PO4 exhibited outstanding cyclability at a C-rate of 0.5, retaining 97% of its capacity at room temperature and 85% at 55 degrees C, due to the synergetic effect of the presence of a uniform carbon coating layer on the primary particles with nanopores in the secondary particles.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据